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java ajax上传文件图片以json形式返回

發布時間：2025/5/22 41 豆豆
生活随笔 收集整理的這篇文章主要介紹了 java ajax上传文件图片以json形式返回 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

jsp頁面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><base href="<%=basePath%>"><title>My JSP 'ajaxtext.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script></head><body><form action='Ajaxtext' method='post' enctype="multipart/form-data" id='form1'><input type="text" name="name"><input type="text" name="age"><input type="file" name="img"><button class="but" type="button">提交</button></form>></body><script>$(function(){$(".but").click(function(){var form= new FormData($("#form1")[0]);console.log(form);$.ajax({url:"Ajaxtext",type: 'POST',data:form,dataType: 'JSON',processData: false,contentType: false,success:function(da){console.log(da);alert(11);},error:function(err){alert("服務器錯誤")}})})})</script> </html>

java頁面 上傳圖片的位置參考 https://blog.csdn.net/qq_43632766/article/details/90017859
注意需要下載

package com.jdbc.servlet;import java.io.IOException; import java.io.PrintWriter; import java.util.Enumeration; import java.util.List;import javax.json.JsonArray; import javax.json.JsonObject; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.taglibs.standard.lang.jstl.test.beans.Factory;import net.sf.json.JSONObject;/*** Servlet implementation class Ajaxtext*/ @WebServlet("/Ajaxtext") public class Ajaxtext extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public Ajaxtext() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubrequest.getRequestDispatcher("/ajaxtext.jsp").forward(request, response);}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubrequest.setCharacterEncoding("utf-8");if(!ServletFileUpload.isMultipartContent(request)) {System.out.println("沒有enctype屬性");return ;}DiskFileItemFactory factory = new DiskFileItemFactory();factory.setDefaultCharset("utf-8");ServletFileUpload servletFileUpload = new ServletFileUpload(factory);servletFileUpload.setHeaderEncoding("utf-8");try {List<FileItem> parseRequest = servletFileUpload.parseRequest(request);for(FileItem name:parseRequest) {if(name.isFormField()) {//普通表單項System.out.println("name"+name.getFieldName()+"value"+name.getString()+"---"+name.getName());}else {//文件項//這里進行上傳圖片的操作//不會可以參考 https://blog.csdn.net/qq_43632766/article/details/90017859System.out.println("name"+name.getFieldName());}}} catch (FileUploadException e) {// TODO Auto-generated catch blocke.printStackTrace();}/** 這里只是教你如何返回*/response.setContentType("text/html;charset=utf-8");PrintWriter writer = response.getWriter();String[] code=new String[3];code[0]="1";code[1]="成功";JSONObject json = new JSONObject();json.put("code",code);writer.print(json);}}

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